——回答清华学生“国民党施行的，是否俄国的主义？”，1924年2月9日
A book can be a friend, a teacher, and a doorway to another world.
The most important step in emancipating oneself from social controls is the ability to find rewards in the events of each moment.
Everything that happens once can never happen again. But everything that happens twice will surely happen a third time.
The truth is often hidden in plain sight.
